A key point that people often miss is that an armed population is extremely difficult to control even if the oppressor has vastly superior equipment and training. The citizenry has the advantage of living there all the time, of being able to hide in the buildings (their own homes), of overwhelming numbers, and of the fact that short of full genocide the oppressor actually needs some compliance from the oppressed to achieve their objectives.

Logistically, it is an absolute nightmare to invade a city of 25% armed and trained citizens versus invading a city that is 1% armed and trained citizens. Access to drones and missiles and tanks doesn't help nearly as much as many people would believe.